I was using a gas duster, and I noticed that it became extremely cold if you kept on using it, and then i had to use it upside down, and it came out as cloudy, and I put my hand in front of it, and it practically froze my hand, so I wanted to buy more cause you can freeze all random things. So I went on Office Max's website, and saw 2 for $10, but also saw for $17-18, a refillable one, and thought that since i'm gonna be wasting a lot of it, I might as well buy a refillable one, but the problem is that it won't be filled with natural gas, which turns liquid when compressed. Will I still be able to freeze crap with it? Here is a link to the refillable duster
http://www.officemax.com/max/solutions/p...
Answer:
Normally, when held in an upright position, the liquid contained in the can immediately changes state into a gas when it leaves the nozzle. Gases compressed into their liquids state release (see endothermic reaction) a great amount of energy during vaporization, which is why under normal use, the can becomes quite cold to the touch. Holding the can upside-down or at a steep angle and spraying does not allow for the liquid to immediately vaporize, causing it to be released as a freezing spray.
Release of a compressed gas generally results in a decrease in its temperature. The thermodynamic principle is known as adiabatic expansion. If you want to freeze stuff, why don't you go down to the supermarket and buy some dry ice?
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